/Engine/Plugins/2D/Paper2D/Source/Paper2DEditor/Public/PaperJSONHelpers.h
Returns true if the object named Key is a struct containing two floats (x,y), populating WH with the values)
static bool ReadXY ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< class [FJsonObject](API\Runtime\Json\Dom\FJsonObject) > Item, const [FString](API\Runtime\Core\Containers\FString) & Key, FVector2D & Out_WH )